AEC Glacier Series Air and Water Cooler Portable Chillers - Manual (Page 26)

Glacier Series Portable Chillers Page 25
3-4 Bypass Valve
Glacier Series portable chillers have a spring loaded by-pass valve used as a safety feature.
If the chilled water shut-off valves are inadvertently closed while the chiller is running, the
factory set bypass valve will open and allow a small amount of water to flow through the chiller.
This protects the chiller from freeze-up and allows the other safety features to remain effective.
The by-pass valve should not be adjusted or tampered with.
3-5 Galvanic Corrosion
The materials used in the construction of the water circuit piping of these chillers are partially
ferrous (iron) and react electro-chemically with non-ferrous metallic materials such as copper.
Some water has dissolved minerals that will greatly accelerate the reaction between dissimilar
metals.
PVC or ferrous piping is recommended to reduce galvanic action. If you must use copper piping,
use dielectric unions at the chiller.
3-6 Water Treatment
Water treatment is an integral part of any piping system. In some locations, raw water may be
used in the system without problem; in other locations, it results in large deposits of scale and
corrosion.
AEC, Inc. offers a complete line of water treatment equipment. Contact your AEC, Inc. Sales
Representative for water testing and treatment options.
3-7 Water-Cooled Chiller Condenser Water
Connections
NXW Series portable chillers can use either city or tower water as a cooling medium. All of the
external piping and connections supplying and discharging water to and from the condenser
should be full size.
Two connections are made to the water cooled condenser:
1. The condenser water supply, labeled CONDENSER WATER IN , is located at the rear of
the chiller, and is the inlet for city or tower water.
Water should be supplied at a maximum temperature of 85°F (29°C) and a minimum
pressure of 25 psi.